JP5326664B2 - Decoder device, digital broadcasting system, TS packet decoding method, and broadcast caption monitoring method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a digital broadcasting system easily identifying the cause of failure when abnormal broadcast subtitle data transmitted by a broadcast station is detected. <P>SOLUTION: When an ancillary subtitle multiplexed signal 1 including video data and ancillary subtitle data multiplexed in an ancillary region of the video data is converted to a TS packet signal 2 in a digital broadcasting signal format including a video TS packet and a broadcast subtitle TS packet by an encoder device 101, the TS packet signal 2 is input to the decoder device 105; a video TS packet included in the TS packet signal 2 is decoded to video data; and the broadcast TS packet is converted to ancillary subtitle data, and multiplexed in the ancillary region of the video data to be output to an ancillary subtitle display device 106. The ancillary subtitle display device 106 outputs subtitle data obtained by decoding the ancillary subtitle data to a video monitor/speaker 107 as a signal superimposed on the video data and displays the subtitle data on a screen. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a decoder device, a digital broadcasting system, a TS packet decoding method, and a broadcast caption monitoring method, and in particular, a decoder device capable of monitoring presence / absence of broadcast caption data in a broadcasting station that transmits a digital broadcast, digital The present invention relates to a broadcast system, a TS packet decoding method, and a broadcast caption monitoring method.

  With the progress of digital broadcasting technology in recent years, a digital broadcasting system (digital broadcasting system) that multiplexes digital teletext signals etc. to broadcast signals related to broadcast programs of video signals and audio signals and sends them to communication satellites and broadcasting satellites is put into practical use. Furthermore, the terrestrial broadcasting system is also starting to shift to digital broadcasting. In such a digital broadcasting broadcast station, Japanese Patent Application Laid-Open No. 2001-203898 “Digital Broadcast Transmitting Device, Digital Broadcast Receiving Device, Digital Broadcast Transmitting / Receiving System, Digital Broadcast Receiving Method, and Computer-Readable Recording Medium” of Patent Document 1 As described, character multiplex broadcasting in which caption data is multiplexed and transmitted in a digital broadcast signal is also performed as in analog broadcasting.

  Therefore, in broadcasting stations that perform digital broadcasting, whether correct data is transmitted not only for video signals and audio signals related to broadcast programs to be transmitted, but also for signals related to caption data multiplexed in the digital broadcast signals. It is necessary to monitor whether or not.

  As shown in FIG. 5, a method for monitoring that a signal related to broadcast subtitle data is correctly transmitted in the transmission of a digital broadcast signal is as shown in FIG. 5 before TS (Transport Stream) packetization, that is, an ancillary area (auxiliary area of video data). Monitoring using a device (ancillary subtitle display device) that can convert the subtitle data (ancillary subtitle data) multiplexed in the area) into a form to be superimposed on the video data and display it on the video monitor, or , Monitoring using a digital broadcast receiver that can be received and displayed on a video monitor in the state that it is further digitally modulated after being TS-packetized into a broadcast radio wave, and either or both monitoring methods are adopted It had been. FIG. 5 is a system configuration diagram showing a system configuration of a related digital broadcasting system.

  As shown in FIG. 5, in the case of digital broadcasting, an ancillary caption multiplexed signal 1 in which video data, audio data, and ancillary caption data are multiplexed is input to an encoder device 101 and transmitted by the encoder device 101. Video data and audio data are each encoded (compressed and encoded) into TS packets, and simultaneously multiplexed into the ancillary area of the video data (that is, the auxiliary area outside the screen that is not displayed on the video monitor). Subtitle data is also converted into TS packets. Here, the caption data multiplexed in the ancillary area of the video data input to the encoder device 101 is generally referred to as ancillary caption data.

  A TS packet signal 2 composed of video data, audio data, and broadcast caption data that has been TS-packetized by the encoder device 101 is digitally modulated by the digital modulator 102 in the broadcast station 100A and then transmitted as a broadcast radio wave 3. .

  In the digital broadcast receiver 201 of each home 200 that has received the broadcast radio wave 3, the broadcast radio wave 3 is decoded and output to the video monitor / speaker 202, and the decoded video signal is displayed on the television screen and decoded. The audio signal is output from the speaker, and the decoded broadcast caption data is superimposed on the video signal and displayed on the television screen. Note that caption data decoded by the digital broadcast receiver 201 is generally referred to as broadcast caption data in order to distinguish it from ancillary caption data.

  Here, the digital broadcasting system monitors video TS packets / audio TS packets / broadcast subtitles output from the encoder device 101 in order to monitor whether TS packets of video data / audio data are correctly transmitted in the broadcasting station 100A. A decoder device 105A that extracts video TS packets and audio TS packets from the TS packet signal 2 composed of TS packets, decodes the extracted video TS packets and audio TS packets, and outputs them as a decoded signal 4A is used. . The decode signal 4A output from the decoder device 105A is input to the video monitor / speaker 107 to monitor whether or not transmission as a digital broadcast program is normally performed.

  Here, the operation of the decoder device 105A will be further described with reference to the block diagram of FIG. FIG. 6 is a block diagram showing an internal configuration of the decoder device 105A in the related digital broadcasting system shown in FIG. The decoder device 105A receives a TS packet signal 2 obtained by multiplexing each TS packet of video data, audio data, and broadcast caption data output from the encoder device 101. In the decoder device 105A, the video TS packet extraction unit 105a extracts the video TS packet from the input TS packet signal 2, and the video decoding unit 105b decodes the video TS packet. Similarly, a voice TS packet is extracted from the input TS packet signal 2 by the voice TS packet extraction unit 105c and decoded by the voice decoding unit 105d.

  The video signal decoded by the video decoding unit 105b and the audio signal decoded by the audio decoding unit 105d are multiplexed by the multiplexing unit 105e and output from the decoder device 105A as a decoded signal 4A. Input to the monitor speaker 107. On the other hand, the broadcast subtitle TS packet included in the TS packet signal 2 input to the decoder device 105A is discarded without being used in the decoder device 105A.

  In the digital broadcasting system of FIG. 5, in order to monitor whether the broadcast subtitle data is correctly transmitted as the broadcast radio wave 3 in the broadcast station 100A, the video ancillary before the TS packetization, that is, as the ancillary subtitle multiplexed signal 1 is used. The ancillary subtitle data multiplexed in the region is superimposed on the video signal by the ancillary subtitle display device 103 and output to the video monitor / speaker 104 as the subtitle superimposed signal 5 so that the broadcast subtitle is correctly transmitted. Monitor whether or not. After the TS packet is made by the encoder device 101, it is further digitally modulated by the digital modulator 102 and other devices, broadcast as the broadcast radio wave 3, the broadcast radio wave 3 is received by the digital broadcast receiver 108, and the received broadcast radio wave is received. 3 is decoded by the digital broadcast receiver 108 and the decoded video signal, audio signal and broadcast subtitle data are sent to the video monitor / speaker 109. The video monitor / speaker 109 displays the decoded video signal on the television screen, outputs the decoded audio signal from the speaker, and superimposes the decoded broadcast subtitle data on the video signal for display on the television screen. . By displaying broadcast subtitle data on the television screen of the video monitor / speaker 109, it is monitored whether or not the broadcast subtitle is being transmitted correctly.

Japanese Patent Laid-Open No. 2001-203989 (page 3-4)

  However, in the related broadcast subtitle monitoring method as shown in FIG. 5, for example, the video is output from the video monitor / speaker 104 via the ancillary subtitle display device 103 at the stage of monitoring before TS packetization. In the stage, although there was no abnormality in the subtitle display, after that, the digitally modulated and broadcast radio wave 3 was decoded, and the digital broadcast receiver 108 decoded and output from the video monitor / speaker 109. If there is an abnormality in the display, there is a problem with the TS packetization by the encoder device 101, or an abnormality occurs in the process of being converted to the broadcast radio wave 3 via a device such as the digital modulator 102 after the encoder device 101. It is not possible to determine whether or not this has occurred.

  The present invention has been made in view of such circumstances, and as a decoder device for monitoring output TS packets of an encoder device, not only video data and audio data TS packets but also broadcast subtitle data TS packets. Decoder device, digital broadcasting system, TS packet decoding that enables monitoring and facilitates identification of the cause when a broadcast station detects an abnormality of the broadcast subtitle data when broadcasting subtitle data is transmitted It is an object of the present invention to provide a method and a broadcast subtitle monitoring method.

  In order to solve the above-described problems, the decoder device according to the present invention employs the following characteristic configuration.

  (1) A decoder device that decodes video TS (Transport Stream) packets into video data, and that converts broadcast subtitle TS packets input together with the video TS packets into ancillary subtitle data.

  According to the decoder device, the digital broadcasting system, the TS packet decoding method, and the broadcast caption monitoring method of the present invention, when an abnormality is detected in the transmission of broadcast caption data in the broadcast station, an abnormality is detected in any circuit unit in the broadcast station. It is possible to easily identify whether it has occurred.

  Furthermore, for video signals and audio signals, the pseudo signal is used to check the normality of the display in the form of subtitle data alone, but by displaying the subtitle data together with the actual video signal / audio signal, the video signal -Since the confirmation of the audio signal and the confirmation of the display of the caption data can be performed at the same time, there is also an effect that the confirmation work can be made efficient.

1 is a system configuration diagram illustrating an example of a system configuration of a digital broadcasting system according to the present invention. It is a block diagram which shows an example of an internal structure of the encoder apparatus in the digital broadcasting system shown in FIG. It is a block diagram which shows an example of an internal structure of the ancillary caption display apparatus in the digital broadcasting system shown in FIG. It is a block diagram which shows an example of an internal structure of the decoder apparatus in the digital broadcasting system shown in FIG. It is a system configuration | structure figure which shows the system configuration | structure of a related digital broadcasting system. It is a block diagram which shows the internal structure of the decoder apparatus in the related digital broadcasting system shown in FIG.

  Hereinafter, preferred embodiments of a decoder device, a digital broadcasting system, a TS packet decoding method, and a broadcast caption monitoring method according to the present invention will be described with reference to the accompanying drawings.

(Features of the present invention)
Prior to the description of the embodiments of the present invention, an outline of the features of the present invention will be described first. The present invention monitors whether or not broadcast subtitle data transmitted together with video data and audio data as TS (Transport Stream) packets in digital broadcasting is normally transmitted, and detects an abnormality in the broadcast subtitle data. At this time, it is characterized in that it is possible to easily specify which circuit unit in the broadcasting station is abnormal.

  That is, the present invention enables a decoder device for monitoring a TS packet signal output from an encoder device to monitor not only video TS packets and audio TS packets but also broadcast subtitle TS packets. It is. Since the broadcast subtitle TS packet output from the encoder device is in the TS packet format, the decoder device once converts the broadcast subtitle TS packet into subtitle data in an ancillary subtitle format and superimposes it on the ancillary area of the video data. Output as a decoded signal.

  Thereafter, an ancillary subtitle multiplexed signal, which is a decoded video signal output as the decoded signal and in which the subtitle data is multiplexed in the ancillary region, is input to the ancillary subtitle display device and multiplexed into the ancillary region. By decoding the caption data and superimposing it on the decoded video signal, the caption data is converted into a caption superimposed signal composed of the video signal on which the caption data is superimposed, and output to the video monitor / speaker. By displaying the converted subtitle superimposed signal on the video monitor, the broadcast subtitle data is displayed in a state superimposed on the video signal, and monitoring whether the broadcast subtitle TS packet is normally transmitted. Is possible.

(Configuration of the embodiment)
FIG. 1 is a system configuration diagram showing an example of the system configuration of a digital broadcasting system according to the present invention. Circuit parts having the same functions as those of the related digital broadcasting system shown in FIG. Is shown. In the digital broadcasting system shown in FIG. 1, a decoder device 105 and an ancillary caption display device 106 are installed in the broadcasting station 100 instead of the decoder device 105A installed in the broadcasting station 100A of the related digital broadcasting system in FIG. Has been.

  In the digital broadcasting system of FIG. 1, an ancillary caption multiplexed signal 1 in which video data, audio data, and ancillary caption data related to a broadcast program produced by the broadcast station 100 are multiplexed is input to an encoder device 101. The encoder device 101 compresses and encodes video data / audio data of the input ancillary subtitle multiplexed signal 1 to form TS packets, which are output as video TS packets and audio TS packets. At the same time, the encoder apparatus 101 converts the ancillary subtitle data included in the input ancillary subtitle multiplexed signal 1 into broadcast subtitle data, and then converts the data into TS packets, which are output as broadcast subtitle TS packets.

  The TS packet signal 2 composed of the video TS packet, the audio TS packet, and the broadcast subtitle TS packet output from the encoder device 101 is subjected to digital modulation and other processing by the digital modulator 102 and other devices, so that the broadcast wave 3 Is output to each home 200.

  In each home 200, the digital broadcast receiver 201 receives the broadcast radio wave 3, and the video TS packet included in the broadcast radio wave 3 is decoded and displayed as a video signal on the video monitor screen of the video monitor / speaker 202. The audio TS packet included in the broadcast radio wave 3 is decoded and output as an audio signal from the speaker of the video monitor / speaker 202, and the broadcast subtitle TS packet included in the broadcast radio wave 3 is decoded to generate an image. It is superimposed on the signal and displayed on the video monitor screen of the video monitor / speaker 202.

  As described above, as the digital broadcasting system shown in FIG. 1 for sending a digital broadcast program to each home 200, video data, audio data, and ancillary subtitle data of the broadcast program produced on the broadcast station 100 side are received at each home 200. This is the flow from the display on the TV screen to the output from the speaker.

(Description of operation of embodiment)
Next, operation examples of the encoder device 101, the ancillary caption display device 103, and the decoder device 105 that constitute the digital broadcasting system shown in FIG. 1 will be further described.

  First, an example of the operation of the encoder device 101 will be described with reference to the block diagram of FIG. FIG. 2 is a block diagram showing an example of the internal configuration of the encoder device 101 in the digital broadcast system shown in FIG. As shown in FIG. 2, an encoder device 101 receives an ancillary caption multiplexed signal 1 in which video data, audio data, and ancillary caption data are multiplexed. The encoder apparatus 101 extracts video data, audio data, and ancillary subtitle data from the input ancillary subtitle multiplexed signal 1 by the video extraction unit 101a, the audio extraction unit 101c, and the ancillary subtitle extraction unit 101e, respectively. .

  The video data extracted by the video extraction unit 101a is compressed and encoded by the video compression encoding / TS packetizing unit 101b, and converted into TS packets as video TS packets. Similarly, the audio data extracted by the audio extraction unit 101c is compression encoded by the audio compression encoding / TS packetizing unit 101d, and is converted into a TS packet as an audio TS packet. Also, the ancillary caption data extracted by the ancillary caption extraction unit 101e is extracted as broadcast caption data by the broadcast caption extraction / TS packetization unit 101f, and is converted into TS packets.

  The video TS packet / audio TS packet / broadcast subtitle TS packet converted into TS packets are TS-multiplexed by the TS multiplexer 101g and output from the encoder device 101 as a TS packet signal 2.

  Next, an example of the operation of the ancillary caption display device 103 will be described with reference to the block diagram of FIG. FIG. 3 is a block diagram showing an example of the internal configuration of the ancillary caption display device 103 in the digital broadcast system shown in FIG. As shown in FIG. 3, an ancillary subtitle display device 103 receives an ancillary subtitle multiplexed signal 1 including video data in which ancillary subtitle data is multiplexed. Inside the ancillary caption display device 103, the decoding unit 103a extracts the caption data multiplexed in the ancillary area of the video data from the ancillary caption multiplexed signal 1, and then decodes and outputs the caption data 6 as the caption data 6. The

  The decoded subtitle data 6 is superimposed (superimposed) on the ancillary subtitle multiplexed signal 1 input to the ancillary subtitle display device 103 in the superimposing unit 103b and converted into a video signal on which the subtitle data is superimposed. The subtitle superimposed signal 5 is output from the ancillary subtitle display device 103 and input to the video monitor / speaker 104 in FIG. The ancillary subtitle multiplexed signal 1 input to the ancillary subtitle display device 103 is the same signal as the ancillary subtitle multiplexed signal 1 in which the video data, audio data, and ancillary subtitle data shown in FIG. The audio data included in the multiplexed signal 1 is input to the video monitor / speaker 104 in FIG. 1 via the ancillary caption display device 103 as it is.

  Next, an example of the operation of the decoder device 105 will be described with reference to the block diagram of FIG. FIG. 4 is a block diagram showing an example of the internal configuration of the decoder device 105 in the digital broadcast system shown in FIG. As shown in FIG. 4, a TS packet signal 2 in which video TS packets, audio TS packets, and broadcast caption TS packets output from the encoder device 101 are multiplexed is input to the decoder device 105.

  In the decoder device 105, the video TS packet extraction unit 105a extracts the video TS packet from the input TS packet signal 2, and the video decoding unit 105b decodes the video TS packet. Similarly, a voice TS packet is extracted from the input TS packet signal 2 by the voice TS packet extraction unit 105c and decoded by the voice decoding unit 105d. Further, a broadcast subtitle TS packet is also extracted from the input TS packet signal 2 by the broadcast subtitle TS packet extraction unit 105f, and the broadcast subtitle TS packet is multiplexed in the ancillary region of the video data by the conversion unit 105g. Converted into ancillary subtitle data in a format to be converted.

  The video data decoded by the video decoding unit 105b, the audio data decoded by the audio decoding unit 105d, and the ancillary subtitle data converted by the conversion unit 105g are multiplexed by the multiplexing unit 105e, and the decoder apparatus The decoded signal 4 is output from 105.

  As described above, unlike the related decoder device 105A shown in FIG. 6, the decoder device 105 shown in FIG. 4 also discards the broadcast subtitle TS packet included in the TS packet signal 2 input to the decoder device 105. Without being converted into ancillary subtitle data, multiplexed with video data and audio data, and output in the form included in the decoded signal 4.

Here, the broadcasting station 100 has a mechanism for monitoring whether or not a digital broadcast is normally transmitted. Furthermore, when it is detected that the digital broadcast is not normally transmitted, in order to make it easy to identify the location where the problem has occurred in the broadcast station 100, an appropriate location in the broadcast station 100 is provided. A monitoring point is placed. In the digital broadcasting system shown in FIG. 1, the following three monitoring points are set in the broadcasting station 100.
(1) First monitoring point (monitoring point by video monitor / speaker 104)
The encoder apparatus 101 monitors whether there is an abnormality in the ancillary subtitle multiplexed signal 1 before encoding.
(2) Second monitoring point (monitoring point by video monitor / speaker 107)
TS packet signal 2 at the stage after encoding by the encoder device 101
Monitor for any abnormalities.
(3) Third monitoring point (monitoring point by video monitor / speaker 109)
The digital modulator 102 and other devices are monitored for abnormalities in the broadcast radio wave transmitted when digital modulation or other processing is performed.

  That is, as the first monitoring point, the ancillary subtitle display device 103 and the video monitor / speaker 104 are used to monitor the ancillary subtitle multiplexed signal 1 including the video data, audio data, and ancillary subtitle data in the previous stage of the encoder device 101. used. The ancillary subtitle display device 103 receives a signal composed of the same video data, audio data, and ancillary subtitle data as the ancillary subtitle multiplexed signal 1 input to the encoder device 101.

  In the ancillary caption display device 103, as described above, first, the ancillary caption data is extracted and separated from the video data and decoded as the caption data 6. Thereafter, the subtitle data 6 is superimposed (superimposed) on the video signal of the input ancillary subtitle multiplexed signal 1 and output to the video monitor / speaker 104 as the subtitle superimposed signal 5, and then to the video monitor / speaker 104. Thus, the caption data displayed superimposed on the video signal is monitored together with the video signal and the audio signal.

  As a second monitoring point, the decoder device 105, ancillary subtitles are used to monitor the TS packet signal 2 consisting of video TS packets, audio TS packets, and broadcast subtitle TS packets output from the encoder device 101 as TS packets. A display device 106 and a video monitor / speaker 107 are used. As described above, unlike the related decoder device 105A shown in FIG. 6, the decoder device 105 also processes broadcast subtitle TS packets.

  That is, the decoder device 105 decodes the video TS packet and audio TS packet that are converted into TS packets as video data and audio data, respectively, and also converts the broadcast subtitle TS packet into ancillary subtitle data. The signal is multiplexed into the ancillary area, and is output as a decoded signal 4 to the ancillary caption display device 106 at the subsequent stage.

  The decoded signal 4 including the ancillary subtitle data multiplexed into the ancillary area of the video data has the same signal format as the ancillary subtitle multiplexed signal 1 input to the encoder device 101. Ancillary subtitle data is extracted / separated and decoded as subtitle data 6, and then the subtitle data 6 is superimposed (superimposed) on the video signal of the input ancillary subtitle multiplexed signal 1 to obtain the subtitle superimposed signal 5. Is output to the video monitor / speaker 107. Accordingly, the video monitor / speaker 107 monitors the subtitle data superimposed on the video signal and displayed together with the video signal and the audio signal.

  As a third monitoring point, a method is used in which the broadcast radio wave 3 output from the digital broadcast system is received by the digital broadcast receiver 108 installed in the broadcast station 100 and output to the video monitor / speaker 109 for monitoring. It is done. The digital broadcast receiver 108 has the same circuit configuration as the digital broadcast receiver 201 installed in each home 200, and can display caption data superimposed on a video signal.

  In the related digital broadcasting system as shown in FIG. 5, it is impossible to monitor whether or not the broadcast subtitle data is normal at the second monitoring point described above. Therefore, when the ancillary subtitle data is normally displayed on the video monitor / speaker 104 at the first monitoring point, the broadcast subtitle data included in the broadcast radio wave 3 is displayed on the video monitor / speaker 104 at the third monitoring point. When displayed in an abnormal state on the speaker 109, any of the encoder device 101, the digital modulator 102, and other devices that are located after the first monitoring point and before the third monitoring point. It was difficult to identify whether an abnormality occurred at the location.

  In the digital broadcasting system of this embodiment shown in FIG. 1, it is possible to monitor the normality of broadcast subtitles at the second monitoring point that monitors the TS packet signal 2 from the encoder apparatus 101.

  Therefore, for example, it has been confirmed that the ancillary caption data included in the ancillary caption multiplexed signal 1 is normal at the first monitoring point, and the broadcast caption TS included in the TS packet signal 2 is detected at the second monitoring point. When it is detected that the packet is abnormal, there is a possibility that an abnormality has occurred in a circuit that is after the first monitoring point and before the second monitoring point, that is, the encoder device 101. It becomes possible to judge that it is high.

  Similarly, it is confirmed that the broadcast caption TS packet included in the TS packet signal 2 is normal at the second monitoring point, and the broadcast caption data included in the broadcast radio wave 3 is detected at the third monitoring point. Is detected on the video monitor / speaker 109 in an abnormal state, a circuit that is after the second monitoring point and before the third monitoring point, that is, the digital modulator 102, etc. It can be determined that there is a high possibility that an abnormality has occurred in the circuit.

  In the digital broadcasting system shown in FIG. 1, the case where the broadcast radio wave 3 is used as means for sending a broadcast program to each home 200 has been described. However, the present invention is not limited to such a case. Broadcast programs may be transmitted using a coaxial cable such as CATV or a wired cable such as an optical fiber.

(Explanation of effect of embodiment)
As described above in detail, with the system configuration of the present embodiment as shown in FIG. 1, when an abnormality is detected in the transmission of broadcast subtitle data in the digital broadcasting system, any circuit unit in the broadcast station 100 is detected. It is possible to easily identify whether an abnormality has occurred.

  Furthermore, for video signals and audio signals, the pseudo signal is used to check the normality of the display in the form of subtitle data alone, but by displaying the subtitle data together with the actual video signal / audio signal, the video signal -Since the confirmation of the audio signal and the confirmation of the display of the caption data can be performed at the same time, there is also an effect that the confirmation work can be made efficient.

The configuration of the preferred embodiment of the present invention has been described above. However, it should be noted that such embodiments are merely examples of the present invention and do not limit the present invention in any way. Those skilled in the art will readily understand that various modifications and changes can be made according to a specific application without departing from the gist of the present invention. For example, the embodiment of the present invention can be expressed as the following configuration in addition to the configuration (1) in the means for solving the problems.
(2) A decoder device that decodes video TS (Transport Stream) packets into video data, and that converts broadcast subtitle TS packets input together with the video TS packets into ancillary subtitle data.
(3) Video data, broadcast information including at least ancillary subtitle data that is subtitle data multiplexed in an ancillary area of the video data, and a digital broadcast signal including at least a video TS (Transport Stream) packet and a broadcast subtitle TS packet In a digital broadcasting system that broadcasts in a format, at least the video TS packet and the broadcast subtitle TS packet are input, the input video TS packet is decoded into video data, and the input broadcast subtitle TS packet is converted into an ancillary subtitle A digital broadcasting system comprising a decoder device that converts the data into an ancillary subtitle multiplexed signal that is multiplexed in the ancillary area of the video data and outputs the signal.
(4) Broadcast subtitle superposition in which subtitle data obtained by decoding the ancillary subtitle data multiplexed in the ancillary subtitle multiplexed signal output from the decoder device is superimposed on the ancillary subtitle multiplexed signal The digital broadcast system according to (3), further including an ancillary caption display device that outputs a signal and a video monitor that outputs and displays the broadcast caption superimposed signal.
(5) After inputting broadcast information including at least ancillary subtitle data that is subtitle data multiplexed in the ancillary area of the video data and the video data, and compressing and encoding the video data of the broadcast information, The video TS packet is encoded and the ancillary subtitle data is extracted as broadcast subtitle data to be superimposed on the video data, then encoded into a broadcast subtitle TS packet, multiplexed with the video TS packet, and output as a TS packet signal The digital broadcasting system according to (3) or (4), further including an encoder device.
(6) The digital broadcasting system according to (5), wherein an output of the encoder device is connected to an input of the decoder device.
(7) A TS packet decoding method for decoding a video TS (Transport Stream) packet into video data and converting a broadcast subtitle TS packet input together with the video TS packet into ancillary subtitle data.
(8) The TS packet decoding method according to (7), wherein the ancillary subtitle data is multiplexed with the video data.
(9) Video data, broadcast information including at least ancillary subtitle data that is subtitle data multiplexed in an ancillary area of the video data, and a digital broadcast signal including at least a video TS (Transport Stream) packet and a broadcast subtitle TS packet. In the broadcast caption monitoring method for monitoring whether or not the caption data is normally broadcast when broadcasting in the format, at least the video TS packet and the broadcast caption TS packet are input, and the input video TS packet Is converted into video data, and the input broadcast subtitle TS packet is converted into ancillary subtitle data and output as an ancillary subtitle multiplexed signal multiplexed in the ancillary area of the video data. Broadcasting that has a monitoring process to monitor whether it is displayed Subtitle monitoring method.
(10) After extracting the ancillary subtitle data multiplexed in the ancillary subtitle multiplexed signal, subtitle data obtained by decoding is converted into a broadcast subtitle superimposed signal superimposed on the ancillary subtitle multiplexed signal, and converted The broadcast subtitle monitoring method according to (9), wherein the broadcast subtitle superimposed signal is output and displayed on a video monitor.
(11) After inputting broadcast information including at least ancillary subtitle data that is subtitle data multiplexed in the ancillary area of the video data and the video data, and after compressing and encoding the video data of the broadcast information, The video TS packet is encoded and the ancillary subtitle data is extracted as broadcast subtitle data to be superimposed on the video data, then encoded into a broadcast subtitle TS packet, multiplexed with the video TS packet, and output as a TS packet signal (9) or (10) broadcast subtitle monitoring method of monitoring whether the broadcast subtitle TS packet is normal immediately after the monitoring step.

DESCRIPTION OF SYMBOLS 1 Ancillary subtitle multiplexed signal 2 TS packet signal 3 Broadcast radio wave 4 Decode signal 4A Decode signal 5 Subtitle superimposed signal 6 Subtitle data 100 Broadcast station 100A Broadcast station 101 Encoder apparatus 101a Video extraction part 101b Video compression encoding / TS packetization part 101c Audio Extraction unit 101d Audio compression encoding / TS packetization unit 101e Ancillary subtitle extraction unit 101f Broadcast subtitle extraction / TS packetization unit 101g TS multiplexing unit 102 Digital modulator 103 Ancillary subtitle display device 104 Video monitor / speaker 105 Decoder device 106 Ancillary Subtitle display device 107 Video monitor / speaker 108 Digital broadcast receiver 109 Video monitor / speaker 200 Home 201 Digital broadcast receiver 202 Video monitor / speaker

Claims (7)

Broadcast information including at least ancillary subtitle data, which is subtitle data multiplexed in an ancillary area of the video data, in the form of a digital broadcast signal including at least a video TS (Transport Stream) packet and a broadcast subtitle TS packet. In the digital broadcasting system that
The broadcast information is input, and after the video data is compressed and encoded in the broadcast information, the video TS is encoded into a video TS packet, and the ancillary subtitle data is extracted as broadcast subtitle data to be superimposed on the video data. An encoder device that encodes TS packets and outputs a TS packet signal in which the broadcast subtitle TS packet is multiplexed with the video TS packet;
At least the video TS packet and the broadcast subtitle TS packet are extracted from the TS packet signal output from the encoder device , the extracted video TS packet is decoded into video data, and the extracted broadcast subtitle TS packet is ancillary. Lud digital broadcast system comprising a decoder device that outputs for monitoring the closed caption converted data, the decoded ancillary caption multiplex signal broadcasting station multiplexes the ancillary subtitle data in the ancillary area of the image data.   The digital broadcast system further includes a digital modulation device that digitally modulates the TS packet signal output from the encoder device to generate a broadcast radio wave,
  The digital broadcasting system according to claim 1, wherein the decoder device is provided between the encoder device and the digital modulation device. Broadcast subtitle superposition in which subtitle data obtained by decoding the ancillary subtitle data multiplexed in the ancillary subtitle multiplexed signal output from the decoder device is superimposed on the video signal of the ancillary subtitle multiplexed signal includes a ancillary caption display apparatus for outputting a signal, and a digital broadcasting system according to claim 1 or 2, characterized in that it comprises a video monitor that displays and outputs the broadcast caption superimposed signal. Digital broadcasting system as claimed in any one of claims 1 to 3, characterized in that formed by connecting the output of the encoder device to an input of the decoder device. Broadcast information including at least ancillary subtitle data, which is subtitle data multiplexed in an ancillary area of the video data, in the form of a digital broadcast signal including at least a video TS (Transport Stream) packet and a broadcast subtitle TS packet. In the broadcast caption monitoring method for monitoring whether or not the caption data is normally broadcast,
The broadcast information is input, and after the video data is compressed and encoded in the broadcast information, the video TS is encoded into a video TS packet, and the ancillary subtitle data is extracted as broadcast subtitle data to be superimposed on the video data. A signal output step of encoding a TS packet and outputting a TS packet signal obtained by multiplexing the broadcast subtitle TS packet with the video TS packet;
Extract at least the video TS packet and the broadcast subtitle TS packet from the output TS packet signal , decode the extracted video TS packet into video data, and convert the extracted broadcast subtitle TS packet into ancillary subtitle data Then, an ancillary subtitle multiplexed signal obtained by multiplexing the ancillary subtitle data in the decoded ancillary area of the video data is output for monitoring at a broadcasting station , and monitoring whether the ancillary subtitle multiplexed signal is normally displayed or not is monitored. monitoring process have that broadcasting subtitles monitoring method have to be.   The broadcast subtitle monitoring method according to claim 5, further comprising a generation step of digitally modulating the TS packet signal output in the signal output step to generate a broadcast radio wave. After extracting the ancillary subtitle data multiplexed in the ancillary subtitle multiplexed signal, subtitle data obtained by decoding is converted into a broadcast subtitle superimposed signal superimposed on the video signal of the ancillary subtitle multiplexed signal, and converted 7. The broadcast caption monitoring method according to claim 5, wherein the broadcast caption superimposed signal is output and displayed on a video monitor.

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